Canadian Electrical Industry News Week

 

Oct 15, 2018

LightingFlashing warning lights are a common line of defence intended to help protect construction workers, police officers, firefighters, emergency medical service personnel, and others who work along the roadway from oncoming traffic. These lights need to capture drivers’ attention yet not be so bright that they distract drivers from seeing workers in and along the roadway.

In collaboration with Pennsylvania State University, the Lighting Research Center (LRC) at Rensselaer Polytechnic Institute conducted a field study to measure drivers’ ability to detect simulated workers adjacent to vehicles equipped with flashing yellow warning beacons varying in peak intensity (25 cd to 700 cd) and flash frequency (1 Hz or 4 Hz), while driving at night. Crash reports reveal that workers do not always wear reflective vests when working along the roadway, thus the study was conducted with and without safety vests on the simulated workers.

The results of the study were recently published in the journal Accident Analysis & Prevention. The paper, “Investigation of flashing and intensity characteristics for vehicle-mounted warning beacons” is authored by Kristin Kersavage, Nicholas Skinner, John Bullough, Philip Garvey, Eric Donnell, and Mark Rea.

The research team found that there was no difference in detection distances between lights flashing at 1 Hz or those flashing at 4 Hz. Detection distances were shortest when the peak intensity of the warning beacons was greater than 150 cd. As expected, the simulated workers wearing safety vests were seen from furthest away where drivers would have the most time to respond, regardless of the warning beacon peak intensity.

The study results can be incorporated into performance standards for flashing warning beacons to ensure that they support worker safety, especially at night.

The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute is the world's leading center for lighting research and education. Established in 1988 by the New York State Energy Research and Development Authority (NYSERDA), the LRC has been pioneering research in solid-state lighting, light and health, transportation lighting and safety, and energy efficiency for more than 30 years.

This article was first published online by the Lighting Research Center; https://www.lrc.rpi.edu/resources/newsroom/pr_story.asp?id=405

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